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( Sunpyo Lee ),( Sung Koo Lee ),( Myeong Sook Seo ),( Taeeun Kim ),( Tae Young Park ),( Tae Jun Song ),( Sang Soo Lee ),( Do Hyun Park ),( Dong Wan Seo ),( Myung Hwan Kim ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Splenic artery pseudoaneurysm is rare and challenging, so that we reported our recent 10-year experience with the clinical features and management of this aneurysm. Methods: A total of 28 patients were diagnosed with splenic artery pseudoaneurysm from January 2004 to December 2013 at a tertiary referral center in South Korea. The electronic medical records and CT images were reviewed retrospectively. Results: Median age was 54 years (IQR, 45.25-67.25). Men were predominant (78.6%). Common causes were acute pancreatitis (7 patients, 25%) and chronic pancreatitis (7 patients, 25%), followed by surgery (5 patients, 17.9%). Nine patients (32.1%) did not have obvious causes. The most common symptom was abdominal pain (14 patients, 50%), followed by bleeding (4 patients, 14.3%) and syncope (3 patients, 10.7%). Eight patients (28.6%) were asymptomatic. Median diameter was 1.3 cm (IQR, 0.7-2.6). Majority of patients (27 patients, 96.4%) had one pseudoaneurysm. Distal-third of pancreas was the predominant location (20 patients, 71.6%). Sixteen patients (57.1%) had hemorrhage from pseudoaneurysm. Symptoms (p<.001), smoking (p=.019), alcohol (p=.031), recent surgery (p=.033), and age under 50 years (p=.049) were signifi cantly related with hemorrhage. Calcifi cation (6 patients, 21.4%) reduced the hemorrhagic risk (p=.01). A total of 22 patients were treated with endovascular intervention (16 patients, 57.1%) and surgery (6 patients, 21.45%). In three patients with post-op psuedoaneurysm, despite endovascular intervention, the hemorrhage was not controlled. Two of them had surgery, and the other died. Pseuoaneurysm was spontaneously regressed in one patient. The remaining 5 patients (17.9%) did not experiencehemorrhage after conservative management. Conclusions: Splenic artery pseudoaneursym is uncommon, and hemorrhage from it is fatal. In case of suspicious bleeding with symptoms, alcohol, smoking, recent surgery, or age under 50 years, treatment must be done. Incidentally found pseudoansurysm with calcifi cation, however, may yield good results with conservative management.
Efficacy of a Three-Dimensional-Printed Training Simulator for Endoscopic Biopsy in the Stomach
Sunpyo Lee,Ji Yong Ahn,Minkyu Han,Gin Hyug Lee,나희경,Kee Wook Jung,Jeong Hoon Lee,Do Hoon Kim,Kee Don Choi,Ho June Song,Hwoon-Yong Jung 거트앤리버 소화기연관학회협의회 2018 Gut and Liver Vol.12 No.2
Background/Aims: We used three-dimensional (3D) printing technology to create a new biopsy simulator for the stomach and investigated its efficacy and realism in endoscopic biopsy training. Methods: A novel stomach biopsy simulator, with 10 biopsy sites, was produced using a 3D printer. We enrolled 26 participants, including 10 residents, six first-year fellows, five second-year fellows, and five faculty members. We recorded and reviewed five training sessions and evaluated the simulator with questionnaires using a 7-point Likert scale. Results: The mean completion time (seconds) was 244.8±11.5 for the residents, 107.9±33.4 for the first-year fellows, 106.8±20.1 for the second-year fellows, and 103.8±19.2 for the faculty members. The completion time became shorter with repetition and was significantly lower for residents by the fifth trial (first trial, 347.0±159.5; fifth trial, 169.6±57.7; p=0.007). The faculty members strongly agreed that the simulator realistically reflected endoscopic handling and was reasonable for endoscopic training (scores of 6.2±0.8 and 6.4±0.9, respectively). Importantly, experienced endoscopists reported that the difficulty levels of the 10 biopsy sites in the simulator were a realistic match for the actual stomach. Conclusions: This endoscopic biopsy simulator created using a 3D printer is a realistic and useful method to improve the biopsy skills of trainee endoscopists.
Inverse Expansion of Taylor's Series and A Generalized Numerical Method for Nonlinear Equations
Lee, Jung-Youn,Lee, Sunpyo 경기대학교 1999 論文集 Vol.43 No.2
This paper presents a theorem that any inverse function, even though it is unknown, can be expanded in power series in terms of the original function and its derivatives. Using the theorem, the power series expansion of an inverse function is easily obtained without finding the inverse function. The theorem is then applied to develope a generalized numerical method for solutions of nonlinear equations. The proposed method is compared to existing methods such as Newton-Raphson's and other higher order methods in the light of its accuracy and errors. This method yields the exact solution with infinite terms in the series, and precisely defines errors of other numerical methods.
이선표 ( Sunpyo Lee ) 한국센서학회 2018 센서학회지 Vol.27 No.4
A Wi-Fi signal network (WSN) system is introduced in this paper. This system consists of several data-transmitting sensor modules and a data-receiving server. Each sensor module and the server contain a unique intranet IP address. A piezoelectric accelerometer with a bandwidth of 12 kHz, a 24-bit analog-digital converter with a sampling rate of 15.625 kS/s, a 32-bit microprocessor unit, and a 1-Mbps Wi-Fi module are used in the data-transmitting sensor module. A 300-Mbps router and a PC are used in the server. The system is verified using an accelerometer calibrator. The voltage output from the sensor is converted into 24-bit digital data and transmitted via the Wi-Fi module. These data are received by a Wi-Fi router connected to a PC. The input frequencies of the accelerometer calibrator (320 Hz, 640 Hz, and 1280 Hz) are used in the data transfer verification. The received data are compared to the data retrieved directly from the analog-to-digital converter used in the sensor module. The comparison shows that the developed system represents the original data considerably well. Theoretically, the system can acquire vibration signals from 600 sensor modules at an accelerometer bandwidth of 15.625 kHz. However, delay exists owing to software processes, multiplexing between sensor modules, and the use of non-real time operating system. Hence, it is recommended that this system may be used to acquire vibration signals with up to 10 kHz, which is approximately 70% of the theoretical maximum speed of the system. The system can be upgraded using parts with higher performance